# Point-to-Multipoint Network

**URL:** <https://forums.digi.com/t/point-to-multipoint-network/1819>\
**Category:** XBee - 802.15.4\
**Created:** [April 11, 2012, 5:08pm UTC](https://forums.digi.com/t/point-to-multipoint-network/1819 "2012-04-11T17:08:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![brkzkn](https://avatars.discourse-cdn.com/v4/letter/b/898d66/32.png) [@brkzkn](https://forums.digi.com/u/brkzkn)\
**Post date:** [April 11, 2012, 5:08pm UTC](https://forums.digi.com/t/point-to-multipoint-network/1819/1 "2012-04-11T17:08:41Z")

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Hi,

I want to build point-to-multipoint network topology. I have 4 XBee Series 1 module. I configured one of them for coordinator, other modules for end device.

Our configure settings;

Coordinator;  
PAN ID: 3456  
DH: 0  
DL: FFFF  
CE: 1  
AP: 1  
MY: 0

Node;  
PAN ID: 3456  
DH: 0  
DL: 0  
CE: 0  
AP: 0  
MY: 1

When I try to sending data wiht X-CTU software, I have problem.

Node can send data to coordinator, but the coordinator doesn’t send data to node. If I change the AP statu( from 1 to 0) this time node and coordinator doesn’t send data.

How can i fix my mistake? Thanks for help…

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**Author:** ![lynnl](https://avatars.discourse-cdn.com/v4/letter/l/22d042/32.png) [@lynnl](https://forums.digi.com/u/lynnl)\
**Post date:** [April 13, 2012, 3:04pm UTC](https://forums.digi.com/t/point-to-multipoint-network/1819/2 "2012-04-13T15:04:31Z")

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With AP=1 on the coordinator, you do need to manually create a valid API frame - complete with checksum. You are doing that, right? Just typing the word ‘hello’ in XCTU at the coordinator (with AP=1) will cause no visual reaction as the coordinator will discard all 5 of those bytes withotu comment.

Using broadcast from coordinator to 3 ‘remotes’ is a valid design in 802.15.4 (but not Zigbee, where broadcast ‘chokes up’ the mesh).